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Is it worth to delegate SPT to earn SPT?

I do not know. Probably yes, if you do not use your staked SPT to curate Splinterlands related posts. Currently I am not delegating SPT.

You can delegate SPT to Brofi to earn BRO, not a lot though.

I did not know this. I will try it out. Thank you.

Ain't you staking SPS aswell? They give you dividends

Yes. 1-3 SPS per day.

I am just selling my SPT and buying other tokens xD

You get more SPS than I do :D