We have been in a one year bear market so yeah, altcoins will go up 40% and more but nobody knows the exact time. That's why in the long run, staking on DeFi platforms like Alchemix or MAXX Finance or investing in POS coins like MATIC and FTM makes sense. You can earn profits of up to 88% APY (in the case of MAXX) while you wait for the next bull run.
Those gains won't be seen anytime soon, we are yet to get a Bitcoin recovery run. If this doesn't happen then none of the altcoins will pump that high unless newly listed tokens but they'll fall like almost instantly. Altcoins going parabolic has to be after the halving event that'll happened in 2024 so that parabolic move should be in 2025 just as the last one happened a year after the halving event in 2020. And this means it isn't time to invest in altcoins yet. For now just stand on the sidelines and watch while you accumulate stablecoin waiting for a perfect buying opportunity.
You can also DCA if you aren't the active type that'll be alerted when the dip starts happening. DAC gives you a chance to buy coins at different prices so it reduced your entering price and keep you in profits assuming the market declines.