Unfortunately, I could not do much, because I resigned from my job.

'quit my job' also works

I was expecting to get hired inby another company, and I did, but I changed my mind.

Basically, I spent my summer looking for jobs and I did not even notice that it has almost ended.

Among the things I would have liked to do, one of them was to ride my bicycle.

I know the next or any other summer I wouldcan do it.

It just haves not been the best summer.

It might not be the funniestmost fun activity, but at least I feel I am committed.

funniest = most funny / hilarious

Unfortunately, I could non't do much, because I resigned from my job.

or

Unfortunately, I couldn't do much because I quit my job.

I was expecting to get hired inat another company, and I did, but I changed my mind.

Basically, I spent my summer looking for jobs and I did non't even notice that it was almost endover.

Among the things I would have liked to do, one of themhave done was to ride a bicycle.

I have been wantingwanted to find places to ride since I arrived in this city.

I know I can do it the next or any other summer I would do it.

or

I know I can do it the next summer or any other.

It just have nosn't been the best summer.

I am still fortunate or at least I feel fortunate to have the truly important things.

It might not be the funniestmost fun activity, but at least I feel I am committed.

Also, I've been studying English.

What outdoor activities did you do this summer? Did you bike?

Unfortunately, I could not do much, because I resigned from my job.

I was expecting to get hired in another company, and I did, but I changed my mind.

Basically, I spent my summer looking for jobs and I did not even notice that it had almost ended / that it was coming to an end.

Among the things I would have liked to do, one of them was to ride a bicycle/bike.

I have/I’ve been wanting to find places to ride since I arrived in this city.

I know that during the next, or any other summer I would eventually do it.

It just might have not been the best summer to do it this year.

I am still fortunate or at least I feel fortunate to have the trulybe doing important things.

What I have done is toI have gone to the gym.

It might not behave been the funniest activity, but at least I feel as though I am committed.

What outdoor activities did you do this summer? Did you bike?

Unfortunately, I could not do much, because I resigned from my job.

alt:
because I quit from my job.

I was expecting get hired in/at another company, and I did, but I changed my mind.

Basically, I spent my summer looking for jobs, and I did non't even notice that it was almost endover.

I have been wanting to find places to ride since I arrived in this city.

I know theat next summer, or any other summer, I would gladly do it.

It just haves not been the best summer.

I am still fortunate or at least I feel fortunate to have the truly important things.

I am still fortunate, or at least I feel fortunate, to have the truly important things in life

It might not be the funniestmost fun activity, but at least I feel I am committed.

Also, studying English.

alt:
Also, I have been studying English.