As @virolino already pointed out, you don't have to quantify anything if you don't want or don't have something to.

I personally quantify my work so, that other people can see what exactly I did and more important which impact I had.

If you have worked about 2,5 years, you have done things, which you can quantify and list in CV. To give you a direction - try to list everything you have done in this company:

1. I implemented CRM service
2. I fixed a bug which slowed down a system
3. I designed a new version of data transfer system
4. I introduced a new ticket dasboard

Then you have to think how all this things helped your company. You can become something like this:

1. It is easier to work with customers.
2. System has better performance
3. More stable data transfer
4. More comfortable work with tickets

And last step is to define how much this things helped company:

1. bringed 2x more customers by better CRM
2. improved system performance by 2x times
3. improved stability/plausibility of data by 4x times
4. saved 10 man/hours per week by introducing better ticket dashboard

Of course you didn't do all this alone, but it is obvious. The point is to provide things, on which you have worked with a team and what you and your team have achieved.

As @virolino already pointed out, you don't have to quantify anything if you don't want or don't have something to.

I personally quantify my work so, that other people can see what exactly I did and more important which impact I made.

If you have worked about 2,5 years, you have done things, which you can quantify and list in CV. To give you a direction - try to list everything you have done in this company:

1. I implemented CRM service
2. I fixed a bug which slowed down a system
3. I designed a new version of data transfer system
4. I introduced a new ticket dashboard

Then you have to think how all these things helped your company. You can use something like this:

1. It is easier to work with customers
2. System has better performance
3. More stable data transfer
4. More comfortable work with tickets

And the last step is to define how much these things helped the company:

1. brought 2x more customers by better CRM
2. improved system performance by 2x times
3. improved stability/plausibility of data by 4x times
4. saved 10 man/hours per week by introducing better ticket dashboard

Of course you didn't do all this alone, but it is obvious. The point is to provide things, on which you have worked with a team and what you and your team have achieved.