This may be harsh but if you want a competitive lizard list under the new book you probably should do a 180 with the current list.
Basic problems with the list is that you have no magic, offense or defence, slow s4 blocks, no bsb and a monster mounted general. S4 doesnt cut it anymore for mainline combat and hasnt really since the release of ogres 2 years ago. Anyone can tell you the problems of a monster general( easy to kill, lots of VPs, gets murdered by artillery). Our leadership took a hit in the most recent book hence we need that bsb for the reroll(always did).
Oldblood on carno was trash tier last book and it only got worse this book(+10pts and -1I). Slann is still the only lord choice for a list that wants to win consistently(i.e. be competitive), at any points level. I'd recommend bsb, becalming and a scroll or bsb, standard of discipline and one of (scroll, focus of mystery, wandering deliberations).
That simple swap improves the list massively as it takes care of magic defense and offense, along with leadership, bsb and removes the big weakness of the monster mounted general.
Second step is to fix the low strength of the list, to this end either get a couple of scarvets in with great weapons or any of the standard cowboy builds (cold one, LA, charmed shield, Dawnstone, sword of might or cold one, GW, armor of destiny). to fit this in you'll have to drop either both dinos or one block of saurus, to be honest I'd drop both to add in the next list fix.
This brings us to the speed of the list, so far we have all M4 blocks and one huge block of skink skrimishers. Golden rule for skinks is as small as possible and as many units as possible. I'd try and get 3x10 man units with javelins in. Next try to fit in some terradons, chameleons or salamanders to add more speed and board control to the list.
These three changes make the list much more competitive and more likely to be able to hold its own against most armies. Compare how the two lists hold up against the standard empire list with 2 cannons, steam tank and demis or the O&G list of savages, trolls and artillery. You probably will even have a fighting chance against WoC, our worst matchup with the exception of the demon prince who I still havent found a reliable counter for. ( assuming the Woc player isnt stupid enough to get charged by an ancient steg with sharpened horns.)