That would be tough. You need to build your own list on your portfolio based on your DYOR and not just by following other's portfolios.

Well then, for a start, try to pick some top performer coins or tokens daily and weekly on the Binance platform. From there, refer to the coin's community and lurk on their group, if any, to somehow see the inside stuff of the projects and how's the community talk about it.

It is just a start then after quite some time, you will be used to it and finally, you can now able to create your own way on how to pick your preferred alts.