Israel does have lessons to learn from the Ukrainian experience. I realize the following might be contentious and will need extra financial expenditure, but I think is feasible.
Firstly, the good news.
The nature of Israeli society fractious as it is, encourages innovation and search for better solutions. In the military this lends itself to Mission Command (Auftragstaktik). This gives flexibility in combat, unlike the rigidity shown by Russian forces. However, Mission Command does rely on discipline, something which is not seen as a prime objective in Israeli society or the IDF. One military analyst gave the following description which I feel is fair. The IDF at its best “is suspended between dynamism and utter chaos” but demonstrated “what could be achieved by surprise, determination and speed.”
Now the bad news.
Start teaching combined tactics at company level, now. Infantry, armour, artillery, air are currently not properly integrated. The different branches of the IDF all do their own thing, only getting together for big, set-piece exercises. The lessons of 1973 and the conflicts with Lebanon seem to be regularly forgotten.
The crew of the heavy APCs, Namer and Achzarit should be provided by the Armor Corps, not the infantry. Doctrine needs to switch to incorporate the unmanned 30mm cannon turrets. In the past I have never been much of a fan of IFVs, preferring the idea of heavy, survivable APCs. However, the Ukrainian conflict demonstrates that utility of APCs or IFVs with sufficient punch to support infantry. There is no guarantee that tanks will always be there to support infantry when needed. Turreted Namers would be an ideal solution.
The training of infantry units, not just the Special Forces or Commando Brigade, needs to be upgraded. The basics of fieldcraft, camouflage and marksmanship require real improvement. It needs to be up to the standards for conventional war, not just counter-insurgence, police action or hybrid warfare.
The provision of anti-tank weapons to infantry needs to be increased. It's no good Israel designing and producing some of the best ATGMs and LAWS, if they are restricted to IDF Special Forces or for foreign sales.
Serious improvement of IDF artillery in terms of both numbers and quality. The sophisticated MLRS which Israel sells abroad need to be acquired by the IDF.
Thought to be given to the provision of air defences for the land forces. There is no guarantee that the IDFAF will be able to provide cover in future wars against a near peer enemy.