Replacing an FSA chainring
The main limiting factor is chainstay clearance.  If your chainrings touch the chainstay it will wear and weaken and eventually fail.  So the first thing is google your bike frame and see what maximum size chainring its rated for.  Do this first.

Once you have that info, get onto Sheldon's gear calculator https://www.sheldonbrown.com/gear-calc.html  and play about with the numbers.    Will changing from 42 tooth to your maximum tooth give enough difference to notice?

Finally, print this PDF https://cdn.shopify.com/s/files/1/0230/9291/files/BCD_finder_tool_v2.pdf in 1:1 scaling, then put your chainring directly on it and see which BCD matches.
Note that 102 and 104 are very close as are 94 and 96.

Armed with those numbers then you can go shopping.  Make sure you fit a new chain (it needs more links anyway) and a new cassette.