For speeding up you should use “Scream” as often as you can.
You have a long straight? Scream at the beginning and run forward. Clear troops on the way with spells and (new) mummies,
so that your troops don’t stop (don’t use mummies too early, because they are slow).
You have a lot of towers standing together? Scream to let your troops attack faster.
Your troops are clumped together at the entrance to the castle area and don’t attack? Scream to guide them to the front (save
the last scream for that!).
Your first troops at the beginning go forward and “suicide”? Hold them back at the tent with scream and accumulate more.
Your troops are killed from an unreachable tower? Scream and let your troops pass this area fast enough so that they don’t die.
Other possible problems:
Your spells and troops have not a high enough level, because you only recently started using them: this will solve over time
(assuming you upgrade them now). One thing though is essential, and the strategy will not work without it: Your swordrain
has to be of a high enough level, so that you instantly kill the “smaller” ranged troops (archer, froster, pyromancer, arblaster)
and leave the others (cannons, mortars) with such a low health, that your frosters can finish them easily. Btw. you can one
shot ogres with swordrain
You use too much frosters in the beginning: normally you would only use cannons, because these determine the overall speed.
But as you can’t defend them with your king alone, you need some frosters (not too much, experiment with this). More
cannons at the beginnig = faster overall time. Exception: Heavy use of defending paladins. And don’t forget to immediately
shield your starting units, right before the first enemiy troops arrive.
You may not believe this: the use of the starting moral has a huge impact on the outcome: e.g. i once had no chance starting
with one cannon and two frosters, but “easily” won with two cannons and one froster.
Chokepoints / parrallel lanes: Accumulate a bunch of cannons and frosters (let’s say ~5 each) and guide them through the path
with your king. After that, get more frosters and an occasional cannon to hold the enemy troops off your back. If you are not
too far away, go back and kill the enemies on the parallel lane with swordrain (shield your troops, too!), then join your front
It may need some time, if your problems relate to a too low level of spells and troops, otherwise this strategy should help you
beating kings of up to 10 levels above you. Choose your targets wisely: the best layout for this attacking combination is one
without or only a few chokepoints and parallel lanes. You should switch to sonic blast (at least level 3) as a priority, and don’t
hesitate to use it against troops: it may feel “wasted”, if there are no towers in range, but it will protect your troops and speed
them up, because they don’t stop for fighting.