First of all, yes, I definitely encourage you to work on Tagalog, since I assume your family speaks Tagalog as well, which means you have native speakers on hand 24/7. As for your second language, that’s completely up to you.
Personally, if I have no desire to study a language, I’ll lose motivation really quickly and I won’t want to study, so make sure you pick a language that you ACTUALLY want to study! If you aren’t studying Spanish as a school subject, and you have no desire to actually learn it, maybe set it aside for later. (although Spanish might help you a little with Tagalog vocabulary and vice versa hehe)
If you’re completely undecided on which language you want to pursue, I suggest you come up with a list of languages you want to learn at some point, and go look up information about each language (scripts, grammar, vocabulary, history, etc). Omniglot is usually a good place to start. I think that’ll help you narrow down your choices :D let me know if you have any other questions~