It really depends on your perspective. If we’re talking about BTC or ETH, most likely it will be for long term without knowing when it will actually push through. The price movement is uncertain and unpredictable, so you may not know when will it happen and it can go up or down without warning.
If it's DCA, then worth it. Else, $100 could only do so much. BTC from 20 - 40K means 100 bucks profit but when that is happening remains unknown, a few years maybe. 100 over a few years ain't gonna be lifechanging.