I don't think anybody has an issue with teams wanting to get better, what the issue with is the continual falsification that Liverpool fans engage in, the lack of honesty which then informs a ludicrous (and somewhat annoying) "it's our year" shouts and then the lack of any reflection when it comes to the year after. You are in no different position to most years and most years you have been nowhere near the title. 1 year in about 28 you went into the final day of the season, with a minuscule chance of winning the league. It doesn't warrant the cockiness and lack of humility.
You are right to point out you finished on 75 points, which was 1 down on the season before. You finished below 3 teams, I know that is completely written out by Liverpool fans who have in their own heads awarded themselves the 2nd place trophy on the basis of entitlement and dislike of continuing to be in Manchester Uniteds shadows.
I have no idea on what basis they are "standing still" while you are moving on. Manchester United have one of the most successful and best managers in world football. If we are using pre-season as a barometer they just beat Real Madrid, the 3 time winners of the European Cup last night. Manchester City won the league with the 2nd youngest squad in the history of the Premier League. Their players will improve again next season, De Bruyne, Sterling, Sane, Laporte, Stones, Jesus are all some way off their best yet. Beyond Arnold it's hard to put a single Liverpool player below 25 in that category for potential.
Spurs look a bit shaky (generally always do) but as has been said, Arsenal could quite easily leapfrog both yourselves and Spurs next season. They've added well and have two strikers who are far more prolific that the supposedly World class Firmino.
Then you've got your lot, who've spent a lot of money but have a manager who imploded after the last World Cup. If it was a choice between winning the league and a similar implosion I know which one seems more likely.