Going forward Alcaraz will need to dial down the intensity and fighting spirt that he shows in smaller tournaments, so that he has more left in the tank for the grand slams and big tournaments, and to sustain success over as long a period of time as possible.
There's a balance to be had though. A mentality that 'only grand slams matter', which Sampras really pushed in the 90s, is very damaging for the sport, as the more interest there is throughout the season and not just at 4 grand slams, the better.
I remember the young Nadal would fight just as hard in every match that he played, regardless of the tournament, round and opponent. For example during his 2008 Chennai semi-final against Moya, he saved 3 match points and won it in nearly 4 hours. Now in the grand scheme of things, whether or not he won a Chennai semi-final (and he was totally spent for the final the next day) wasn't significant for his career, or in the immediate term for his Australian Open prospects. I think the following year, he pushed his body to the limit to try and win a title in Rotterdam (I think he lost to Murray in the final). He then learned that he needed to pick his battles and conserve his energy as much as possible. A few years later, I remember watching him play Tsonga at Queen's, losing the 2nd tiebreak, and then basically not bothering to compete or exert himself in the 3rd set. That made perfect sense, as he had already played a huge number of matches during the season, and whether or not he beat Tsonga at Queen's (I think that was in 2011 when he had won Wimbledon the last 2 times he entered it), was irrelevant for his Wimbledon title chances, he just needed to get some match practice on grass beforehand.