*What's your secret for massive gains during a pump in the cryptocurrency market.
Patience, wisely chosen coins and satisfaction when you see the profits, not being greedy and wasting all the gains in another project or coin. Personally, I keep my investment limited to few coins only, mainly Bitcoin, and high market cap coins only.
*Are pump signal announcements legit for investors who want to take advantage of the current market trend?
Nop, this is a total scam where 99.99% of these services are sharing tokens or coins inside their own platform, and scam you when you deposit. Otherwise, there are many tricks to steal your money, and convince you with their fake and significant gains. The solution and better way is to learn trading yourself.
*What could possibly be the gains of pumps for any new or old cryptocurrency like Bitcoin?
Your question is a bit unclear for me, but I will answer it as I understood. When the market is going on a bullish trend, which means many good news released and many new investors joined and bought more coins. Your gains are dependent upon the amount of your coins you have bought before the price went up, and also the coin you have chosen.