With hundreds of millions pumped into the clubs from investors who were happy to keep feeding the club. Also starting at time when things like financial fair play wasn't a thing and the PL was very very different with basically Man Utd and Arsenal domianting for years.
I think if KP put in £100 - 200 million a season from their own pocket perhaps we can become a Chelsea or Man City. But i wouldn't want to deal with the consequences long-term in case KP go away.
I believe if we keep investing in promising talent, keep up our academy and ensure that for the next 2 or 3 seasons we only sell one major asset. This along with top training facilities, top 6 finishes every season for 2 or 3 more seasons, a stadium expansion and a tactically strong, competent and motivating manager, will mean we could do a Spurs. Then try to push on if we can. Spurs have been run excellently as far as I can see.
Of course i realise that we also need some real good luck in the above and that a lot of things have to align. If Rennie is leaving we need an able replacement to try to stay as injury-free as possible. For me, our academy is key, so investing in it is very important.
One more thing - i think we need to work on furthering the LCFC brand. Getting more shirts out to different countries. Something to take us away from being that team who achieved the impossible to much more.