If you want to be prepared for long term hold without worrying about the safety of your cryptocurrencies then you should buy a hardware wallet. Nano Ledger wallet is one of the best hardware wallet in my opinion and that is the best way to preserve a cryptocurrency for long term hold since it is very secure and you really have your cryptocurrency since it is on your hands.
I think there are way too many things you should do before you buy a hardware wallet. Learn to use a light client first, learn how to set fees, how to RBF and all that.
I've seen too many people just go out and buy a hardware wallet only to either lose it or forget the seed or private key.
Yeah, so secure even you can't access it forever.
Hold that projects that have a real use is an error for me.
Watch Verge, Pivx, Neo, Dogecoin, Nexus, Cloakcoin, ... It's an analysis error ..
You need to hold the lowcap / altcoin that can generate the most FOMO and hype. It's very different. Personally I do not care about the use case .. On the other hand if I see that the project develops issues that can generate strong speculation then I buy.
The next hype / fomo could be:
Mimblewimble technology (Beam, Grin, Bitgrin,...)
A new consensus (ex: Nyzo)
Non-collateralised Stablecoin (Haven Protocol, Bitcash, Triton, RSR, ...)
Full anonymity by default (Veil, Piratechain, ...)
Security token
To simplify bitcoin, more refined (Cruzbit for example)
The resisting quantum altcoins (Snowblossom, Mochimo, ...)
A new type of masternode (Sinovate)
The old hype 2016/2017 was these themes:
Zerocash and zerocoin technology (Zcash, Zclassic, Zencash, private Bitcoin, Zcoin, and many other forks, ...)
Masternodes (Pivx, Smartcash, Zencash, ...)
The next Ethereum (Neo, Ark, Qtum, Waves, Stratis, ...)
the DPOS consensus (Neo, Ark, Cadano, Rise, ...)
BTC fork (Bitcash, Bitcoin Gold, Bitcoin Diamond, Bitcoin private, ...)
Integrated Tor (Verge, Kore, Deeponion, ...)
Token exchange (BNB, Huobi Token, Bibox, and many others, ...)
That's how I look for the next jewels!