If you're interested in a long-term strategy, I'd suggest you a very simple conservative strategy:
1. Split your investment into top10 coins by market cap. You get lower risk and average profit.
2. Rebalance your portfolio once in a month.
3. Enjoy
Sounds easy and logical. Except, what top10 you mean?
For example the top 10 of
https://coinmarketcap.com/- Top10 on Cryptocurrency Market Capitalizations
- Top10 on Monthly Volume Rankings (Currency)
- Top10 of... ??
edit: Sorry, my bad.. English not my native language. You wrote it..