You may know them or have a lot of experience whith using them.

Maybe you think that you opened a big sourfound have an abundance of possibilities to make new contacts.

It's true.

Specify what is true, that you found a new way to find many people. "It is true that..."

But on the other hand, you have a bigmany choice ands such that every new contact will have less value to you.

BThis happens because you can always find a new contact.

It is very important to say "stop" yourself.

Perhaps what you are trying to say is that someone who uses this app should have self control? "It is very important to have self control when you are faced with so many people to choose."

The Illusion of cChoisce

Today I would like to tell youalk/write about dating apps.

You know them orare probably familiar with them or perhaps you have a lot of experience whit using them.

Maybe you think that you opened a big source ofthe door to a world of new possibilities to makeand new contacts.

A little complicated, but more colourful

But on the other hand, you have a big choice andso much to choose from, that every new contact will have less value to you.

I don't like the combination "a big choice".

You have ample choice
You have a wide variety
You have much to choose from
You have a wide range of options
Etc.

Because yYou can always find a new contact.

Use "because" to join this phrase to the previous. Starting a new phrase with because can sound a bit clunky

It is very important to say "stop"tell yourself to stop.

It's very important to take a step back.
... to take a breather

Illusion of choisce

You know them or have a lot of experience whith using them.

Maybe you think that you openhave discovered a big source of possibilities to make new contacts.

But on the other hand, you have a bigmight have too much choice and e. Every new contact will have less value to you.

It is very important to say "'stop"' to yourself.

Illusion of choisce

Today I would like to tell you about dating apps.

or you might say "I would like to discuss dating apps", which in my opinion would fit best here

You might know them or might have a lot of experience whith using them.

I would add "might" because it implies the person is likely to know dating apps and have experience with using them but it still excludes this possibility, because not 100% of people know and use dating apps. In English, you can often use "might and "may" to imply such nuances of likelihood

But, on the other hand, you have a big choice and every new contact will have less value to you.

Illusion of cChoisce

We usually capitalize the important words in a title.

You know've heard of them or have a lot of experience whit using them.

US alternative

Maybe you think that you opened a big source of possibilities to make've thought that you've found a possible big source of new contacts.

This sounds more natural in the US.

But on the other hand, you have a biglot of choices and now every new contact will have less value to you because you can always find a new contact.

Because you can always find a new contact.

It is very important to say "stop" to yourself.